He went on to claim five wins and four losses in the remainder of 2006. McDermott remained at Harlequins for a further four seasons but the team decreased in performance. The team which had been in the top 5 in the year before McDermott's arrival finished 7th, then 9th then 9th again. Harlequins RL went on three long streaks of very poor form in the last season and a half of McDermott's tenure. The 2009 saw a second half of the season collapse with the team winning only 1 of its last 12 games and finishing 11th. The 2010 season saw an early win against Catalans Dragons, but again only one win in the first 11 games. There were quite a few big losses by scores such as 62-4, 58-0 and 52-12. After a midseason streak of four wins in five games, the team again returned to losing form, losing 7 out of the last 9. McDermott had not secured the team's better players to new contracts, such as Louie McCarthy-Scarsbrook, Will Sharp, Danny Orr, Oliver Wilkes and Luke Williamson and the team had finished 11th and 13th in successive seasons. Leeds Rhinos McDermott left Harlequins and returned to Leeds as Assistant Manager at the end of the 2010 season. On 25 October 2010, following the resignation of incumbent coach Brian McClennan, it was announced that McDermott would take over as head coach at Headingley on a three-year contract. McDermott coached Leeds to the 2011 Challenge Cup Final defeat by Wigan at Wembley Stadium. However, McDermott guided Leeds to 2011 Super League Grand Final victory over St. Helens at Old Trafford, after finishing in 5th place in the league. McDermott replicated the same feat in 2012, where Leeds won the World Club Challenge against Manly. He coached Leeds to their 2012 Challenge Cup Final defeat by Warrington at Wembley Stadium. Two months later, the two sides met again in the 2012 Super League Grand Final which Leeds won for the sixth time in nine years with the victory over Warrington at Old Trafford and making it two out of two for McDermott in his first two years as head coach. By coincidence, on 12 April 2013 Leeds United announced their new manager as Brian McDermott, meaning that both the rugby league and football teams in the city of Leeds had managers with the same name. Both sides also had players